dedenda

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Cycloid gear — The cycloidal gear profile is a form of toothed gear used in mechanical clocks. The gear tooth profile is based on the epicycloid and hypocycloid curves, which are the curves generated by a circle rolling around the outside and inside of another… … Wikipedia
dedendum — /di den deuhm/, n., pl. dedenda / deuh/. Mach. (on a gear or rack) the radial distance between the pitch circle or line and the root circle or line. Cf. addendum (def. 3a). [1900 05; < L: to be given up, ger. of dedere, equiv. to de DE + dere… … Universalium

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